Water-circulation for tuyeres



(No Model.) v 4 Sheets-Sheet 1. E. A. UEHLING.

WATER CIRCULATION FOR TUYERES, BLAST FURNACES, m. No. 330,442. Patented Nov. 17, 1885.

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E. A. UEHLING. WATER CIRCULATION FOR TUYERES BLAST FURNACES, &c. No. 330,442. Patented Nov. 17, 1885.

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(No Model.) 4 SheetsSheet 3.

E. A.-UEHLING.

WATER CIRCULATION FOR TUYERES, BLAST FURNACES, &o.

No. 330,442. Paten ed Nov. 17, 1885.

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(No Model.) 4 Sheets-Sheet 4. E. A. UEI-ILING.

WATER CIRCULATION FOR TUYERES, BLAST FURNACES, 62:0.

No. 330,442. Patented Nov. 17, 1885.

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WATER-CIRCULATION FOR TUYERES, BLAST-FURNACES, 80c.

SPECIFICATION forming part of Letters Patent No. 330,442, dated November 17, 1885.

Application filed April 28, 1885. Serial No. 163,753.

To all whom it may concern:

Be it known that I, EDWARD A. UEHLING, a citizen of the United States, residing at Bethlehem, in the county of Northampton and cient, and to prolong the working condition of the water-cooled and of the water-cooling devices.

In my improved system the circulating tubes, pipes, or channels are arranged and connected with special provision for the switching out of those parts more exposed to the intense heat, and which thereby become leaky,without interrupting or interfering with the work or materially affecting the serviceableness of the cooling device.

The circulating deviceis made in sections, and the provision for switching out any one which may become defective and leaky also includes provision for changing the supplyinlet, so that the circulation may be continued while making such change.

My invention also embraces a method in which, in the normal condition of the circulation, there are two or more streams circulating in opposite directions, which is thebest possible condition of circulation for cooling and preserving the device to which it may be applied. In such opposite circulation of streams the flow can be directed at once to and about the most exposed part of the device, and thus tend to reduce the liability of burning out such exposed part to a minimum. In such cooling circulation provision is made by which the total available waterpressure is utilized in the circulatingcoil and the water-consumption reduced to a minimum. These are the matters to which my invention is directed, and which I will now more particularly describe preparatory to a designation by specific claim of the matters which constitute my invention.

In the accompanying drawings I haveillustrated my improved water-circulation as ap- (No model.)

plied to that portion of a smelting -furnace through which the molten metal is tapped, and to a tuyere and tuyere-breast; but it is applicable to all devices requiring water-circulation for cooling and for protection in which leakage is inadmissible.

Referring to these drawings, Figure 1 represents the tapping notch and the tappinghole of what is known as a dam-plate or water-dam of a smelting-furnace provided with my improved Water-cooling system, in which the circulation is in one direction. Fig. 2 represents thewater-cooling system applicable to tuyeres, water breasts, 830., in which the circulation is in opposite directions. Fig. 3 represents a sectional View of a tuyere and tuyere-breast in their relative position in the iurnace-wall and my water-cooling system applied thereto. Fig. 4 represents an elevation of the system of pipes shown in Fig. 8.

It is well known to those having practical experience about blast and similar furnaces that the most forward coil, or that part of the water-cooling system now in use which is most exposed to the heat, is the first to be burned through, and when this happens to the tuyere or water breast they must be removed at once and replaced by new ones, causing great inconvenience and delay, besides the expense. By myimprovement the liability to burn is, in consequence of the water-currents in opposite directions, reduced to a minimum, whileif it does burn so as to become leaky the damaged coil can be switched out of the system in avery few minutes.

Referring, now, to Fig. 1, '1 indicates the tapping-notch, and t a tapping-hole, above, around, and contiguous to which openings the water-circulation is applied in coils of separate and distinct sections, A, united by couplings B at the points of their return-bends. These are the coils of the cooling system most exposed during the time the metal isrunning from the furnace, and sooner or later they will be out through, generally the inner or supply coil first. When this occurs, this inner or supply coil is switched out of the system by removing its joining-coupling and changing the inlet from a to b, and circulation is again complete, the switched-out section having no function. In the event of the coil b a being cut through, it is in like manner switched out of the system, and the pipe 0 a is made the inlet for the system. Thus by simply changing the inlet the system can be used to good effect after its inner coils are destroyed as members of the cooling system.

In the disposition of the coils shown in Fig. 1 the inlet is at the inner coil, (1, and the discharge is at the outer coil, 0', the circulation being back and forth in the parallel branches ofthe coils on each side of and around the tap-openings, the several coils being joined, for convenience, all at one side of the dam outside of the jacket of the furnace.

In Fig. 2 I have shown the system of coils adapted foratuyere,with provision for switching out a defective coil from the system. In this arrangement and disposition of the coils the water enters at b, follows the inner coil, b,which terminates in an outer branch,which at b enters a third coil from the inner one and terminates in an outer branch,which at b enters a fifth coil from the inner one, which makes the third circuit, terminating in the outer discharge-branch, b the flow of the water being through the first, third, and fifth coils of the system. Inlike manner, the water entering at a passes through the second, fourth, and sixth coils and discharges at c If the coil b becomes damaged or destroyed, the inlet is changed to If, and while this change is being made the circulation continues through thecoils a a a If a becomes leaky, the inlet a is changed to a and while this change is being made the circulation is maintained through the coils 1) 72 This not only gives an uninterrupted circulation through the system, but

' in its normal condition a circulation in which there are two streams flowing in opposite directions, each direct to the most exposed part of the coil. In this disposition the system is composed of separate and disconnected coils or sections, each having an inlet and an outlet, the coils in each section being so placed that the flow through the inner coil will be in a direction opposite to that in the next outer coil. This opposite flow may extend in the same manner through all the sections; but its chief advantage is directed to those coils which are exposed to the greatest heat, and which surround the tuyere-nose. As each section is composed of several coils, the transfer of the inlet, as stated, simply isolates one coil of the section from the system; and for this purpose each coil has a side projected branch provided with a coupling, 0, in convenient position for making the change of inlet, and as the coils of one section are in intermediate relation with the coils of another section all the sections of the system remain in use as long as a serviceable circulation can be maintained.

In Figs. 3 and 4 the circulation system is shown as applied to a tuyere and to a tuyerebreast of a blast-furnace, the construction and disposition of the coils being different, as a modification, from that shown in Figs. 1 and 2. In this arrangement the water flows in opposite directions in coils of separate and distinct sections; and I have shown valves for so regulating the circulation for the-tuyere and for the breast-pipes that the total available water-pressure is utilized in the circulatingcoil and the water-consumption reduced to a minimum. In this arrangement I have shown the separate sections of the coils in communication with the main supply-pipe W,in which A and B are the inlet-valves for the tuyere, and O and D are the inlet-valves for the tuyerebreast. Passing through the valve B, and following the straight pipe-joints b b b, Figs. 3 and 4, the water enters the tuyere-stock E at b, passing thereto forward through the pipe and coil 1) b to the nose F of thetuyere,mak'- ing a complete circuit and returns back, and, re-entering at bflpasses thence forward through the pipe shown in dotted lines in Fig. 3, makes a circuit,returns,and, re-entering at b repeats a similar course and passes through the regulating-Valve B" at the-discharge b. In asimilar manner the Water entering the tuyerebreast through the inlet-valve D passes forward through the pipe and coil 01 d, traverses an identical path,and passes through the regulating-valve D at at. The water entering through the valves A and Oflows quite similar 0 after d makes six, consecutive revolutions before passing out through the regulatingvalves 0 D Now, referring to these Figs. 4 and 5, suppose the nose coil b to become leaky, all that is required is to close thesupply-valve B, u ncouple the union-jointsutd, turn thepipesections Z2 and b on the elbows 4 and 5 to the position indicated by dotted lines, Fig. 4, screw theunion-jointstogether,openthevalveB,and full circulation will be established and the tuyere is as good as before, except that it is shortened equal to the diameter of the burned coil. If,next, the coil ais burned through, the same operation is performed on the valve A, pipes at and a and the union 'oints u and a Again, if the coil b becomes destroyed, the pipe I) is simultaneously turned about the elbows 3and 4 and a new connection effected with a. If, next, the coil a burns through, the operation is exactly similar. When 1) becomes leaky, the valve B is closed and left so; and, finally, when a becomes damaged the coiling device is destroyed and the tuyere must be removed. The switching out of leaky coils in the tuyere-breast being identical with that of the tuyere it is deemed unnecessary to repeat the description.

From the foregoing it is evident that the durability of the water-cooled part or device is increased by reason of the provision for switching out the coils only as they become leaky and unfit members of the system.

As illustrated in Figs. 3 and 4, the tuyere is equal to six ordinary tuyeres,and the-tuyerebreast is capable of standing as long as four with the common system of water-cooling circulation. Moreover,in the cooling circulating appliances now in use the quantity of the water is regulated by the inlet-valves, and, the desirable back-pressure is, in a limited measure, produced by giving the dischargepipe an upward bend. Since the discharge must always be in sight and within easy reach, it is evident that the back-pressure can only in exceptional cases exceed a head of five feet of water. The pressure on the supply-pipe, on the other hand, is generally considerable and rarely below that equal to a head of thirtyfeet of water. Therefore only a small fraction of the pressure in the supply-pipe is available as back-pressure on the circulating water. The drawback to such a relation is that occluded air,as well as generated steam,will occupy six times the space in the circulating water than would be the case if the total pressure in the supplypipe were available on the circulating current,and the danger of burning the coils is increased in the same ratio.

By the provision of the regulating-valves, as described, the total existing Waterpressure becomes available to the circulating steam, and maximum results in efficiency are obtained.

The described arrangement of the independent circulating coils or chambers composing the tuyere-stock brings one in advance of the other, and each extends from the inner to the outer face of the tuyere-stock and of the tuyerebreast, so that the entire surface of each coil or chamber is utilized as a cooling medium.

I do not claim a tuyere composed of two or more independent convolutions of pipe, one in advance of the other, each coil having an inlet and an outlet. Nor do I claim a watercirculation in which the flow is in opposite di rections; but my claims embrace such opposite flow, in connection with provision for changing the inlet from one coil of the system to another; and I claim certain constructions and combinations whereby fixed coils or circulating-tubes are combined with fixed inlets and outlets and intermediate movable sections, whereby the flow is changed through the independent coils from the same inlet, and

I claim other matters,as follows:

1. The combination of a tuyere stock or breast composed of two or more independent fixed coils or circulating-tubes with fixed inlets and outlets and intermediate movable sections communicating with the fixed coils and with the fixed inlets, whereby to change the flow through the independent coils from the same inlet.

2. The vcombination of a tuyere stock or breast composed of two or more independent fixed coils or circulating-tubes with fixed inlets and outlets, intermediate movable sections, and union-joints arranged and connected to change the supply from one fixed coil to another, substantially as described, for the purpose specified.

8. A system of water-circulating tubes or coils arranged in separate and distinct fixed sections in which the circulation is in opposite directions, in combination with fixed supply and outlet pipes and intermediate movable communicating sections, substantially as described, for the purpose specified.

4. The combination, with a tuyere stock or breast, of a water cooling and protecting system for the part exposed to the heat,having a water-flow in fixed contiguous separate coils or pipes in opposite directions, fixed supply and outlet connections, intermediate movable communicating sections, and inlet and outlet valves, substantially as described, for the purpose specified.

5. The combination, with a tuyere or appliance for metallurgical furnaccs,of a water cooling and protecting system for the part exposed to the greatest heat, having a water-flow in contiguous coils or pipes in opposite directions, and provision for changing the inlet to the system from one coil or part to another, and thereby exclude from the system of opposite currents a leaky or burned-out part, sub stantially as herein set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

EDWARD A. UEHLING. WVitnesses:

I'IARRY S. SMITH, T. A. UEHLING. 

